LIMNAA. 131 
3.- L. AURICULARIA (ear-shaped) Linné. Pl. VII., f. 4. 
Globosely ovate, thicker than ZL. jeregra, fairly glossy, semi- 
transparent; whorls 4 to 5, very tumid; sfzve very short; apex 
sharp ; south very large, with outer lip widely reflected. A. 29mm. 
B. 21 mm. 
This interesting species named after a somewhat 
strained resemblance to the human ear, is found in rivers, 
lakes, ponds, and canals throughout Great Britain, as far 
north as Fife. In Ireland it has not been recorded for 
the south-west or north-east, but further investigation of 
that country will probably give it a wider range. It is 
very common and particularly fine in the Thames, near 
Maidenhead. Like all the larger members of this genus 
it is generally the better for the application of a soft 
tooth-brush. 
Var. I. actta ( Jeff.). Smaller, oblong, mouth narrower. 
Var. Il. dlbida (Jef.). White. 
Var. III. mdégna (Colb.). Larger, mouth narrower, 
upper edge of lip as high as the apex of the spire. A. 
32 mm. 
Var. IV. vreflexa (Nelson). Outer lip much reflected. 
Var Ve) nor Civog.). Smaller. A, 17mm Bs 
5. Cnt. 
Var. Vw sampla. ( flavim.), Spire ‘short, aperture 
extending beyond apex. 
